teralytic / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed by teralytic

targets/hal/TARGET_STM/TARGET_STM32L4/rtc_api.c@71:a5b1c83f05dc, 2016-02-25 (annotated)

Committer:
mbed_official
Date:
Thu Feb 25 09:45:11 2016 +0000
Revision:
71:a5b1c83f05dc
Parent:
48:b854a29e778d
Child:
103:173fc4c67e73
Synchronized with git revision 8577dc9680abc50885f129a77852579c5a5bc527



Full URL: https://github.com/mbedmicro/mbed/commit/8577dc9680abc50885f129a77852579c5a5bc527/



l476rg rtc

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /* mbed Microcontroller Library
bogdanm 0:9b334a45a8ff 2 *******************************************************************************
bogdanm 0:9b334a45a8ff 3 * Copyright (c) 2015, STMicroelectronics
bogdanm 0:9b334a45a8ff 4 * All rights reserved.
bogdanm 0:9b334a45a8ff 5 *
bogdanm 0:9b334a45a8ff 6 * Redistribution and use in source and binary forms, with or without
bogdanm 0:9b334a45a8ff 7 * modification, are permitted provided that the following conditions are met:
bogdanm 0:9b334a45a8ff 8 *
bogdanm 0:9b334a45a8ff 9 * 1. Redistributions of source code must retain the above copyright notice,
bogdanm 0:9b334a45a8ff 10 * this list of conditions and the following disclaimer.
bogdanm 0:9b334a45a8ff 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
bogdanm 0:9b334a45a8ff 12 * this list of conditions and the following disclaimer in the documentation
bogdanm 0:9b334a45a8ff 13 * and/or other materials provided with the distribution.
bogdanm 0:9b334a45a8ff 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
bogdanm 0:9b334a45a8ff 15 * may be used to endorse or promote products derived from this software
bogdanm 0:9b334a45a8ff 16 * without specific prior written permission.
bogdanm 0:9b334a45a8ff 17 *
bogdanm 0:9b334a45a8ff 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
bogdanm 0:9b334a45a8ff 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
bogdanm 0:9b334a45a8ff 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
bogdanm 0:9b334a45a8ff 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
bogdanm 0:9b334a45a8ff 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
bogdanm 0:9b334a45a8ff 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
bogdanm 0:9b334a45a8ff 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
bogdanm 0:9b334a45a8ff 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
bogdanm 0:9b334a45a8ff 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
bogdanm 0:9b334a45a8ff 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
bogdanm 0:9b334a45a8ff 28 *******************************************************************************
bogdanm 0:9b334a45a8ff 29 */
bogdanm 0:9b334a45a8ff 30 #include "rtc_api.h"
bogdanm 0:9b334a45a8ff 31
bogdanm 0:9b334a45a8ff 32 #if DEVICE_RTC
bogdanm 0:9b334a45a8ff 33
bogdanm 0:9b334a45a8ff 34 #include "mbed_error.h"
bogdanm 0:9b334a45a8ff 35
mbed_official 71:a5b1c83f05dc 36 #if DEVICE_RTC_LSI
bogdanm 0:9b334a45a8ff 37 static int rtc_inited = 0;
mbed_official 71:a5b1c83f05dc 38 #endif
bogdanm 0:9b334a45a8ff 39
bogdanm 0:9b334a45a8ff 40 static RTC_HandleTypeDef RtcHandle;
bogdanm 0:9b334a45a8ff 41
bogdanm 0:9b334a45a8ff 42 void rtc_init(void)
bogdanm 0:9b334a45a8ff 43 {
bogdanm 0:9b334a45a8ff 44 RCC_OscInitTypeDef RCC_OscInitStruct = {0};
bogdanm 0:9b334a45a8ff 45 RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
bogdanm 0:9b334a45a8ff 46 uint32_t rtc_freq = 0;
bogdanm 0:9b334a45a8ff 47
mbed_official 71:a5b1c83f05dc 48 #if DEVICE_RTC_LSI
bogdanm 0:9b334a45a8ff 49 if (rtc_inited) return;
bogdanm 0:9b334a45a8ff 50 rtc_inited = 1;
mbed_official 71:a5b1c83f05dc 51 #endif
bogdanm 0:9b334a45a8ff 52
bogdanm 0:9b334a45a8ff 53 RtcHandle.Instance = RTC;
bogdanm 0:9b334a45a8ff 54
bogdanm 0:9b334a45a8ff 55 // Enable Power clock
bogdanm 0:9b334a45a8ff 56 __HAL_RCC_PWR_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 57
bogdanm 0:9b334a45a8ff 58 // Enable access to Backup domain
bogdanm 0:9b334a45a8ff 59 HAL_PWR_EnableBkUpAccess();
bogdanm 0:9b334a45a8ff 60
bogdanm 0:9b334a45a8ff 61 // Reset Backup domain
bogdanm 0:9b334a45a8ff 62 __HAL_RCC_BACKUPRESET_FORCE();
bogdanm 0:9b334a45a8ff 63 __HAL_RCC_BACKUPRESET_RELEASE();
bogdanm 0:9b334a45a8ff 64
mbed_official 71:a5b1c83f05dc 65 #if !DEVICE_RTC_LSI
bogdanm 0:9b334a45a8ff 66 // Enable LSE Oscillator
bogdanm 0:9b334a45a8ff 67 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
bogdanm 0:9b334a45a8ff 68 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured!
bogdanm 0:9b334a45a8ff 69 RCC_OscInitStruct.LSEState = RCC_LSE_ON; // External 32.768 kHz clock on OSC_IN/OSC_OUT
bogdanm 0:9b334a45a8ff 70 RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
bogdanm 0:9b334a45a8ff 71 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) == HAL_OK) { // Check if LSE has started correctly
bogdanm 0:9b334a45a8ff 72 // Connect LSE to RTC
bogdanm 0:9b334a45a8ff 73 PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC;
bogdanm 0:9b334a45a8ff 74 PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSE;
bogdanm 0:9b334a45a8ff 75 HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
bogdanm 0:9b334a45a8ff 76 rtc_freq = LSE_VALUE;
mbed_official 71:a5b1c83f05dc 77 } else {
mbed_official 71:a5b1c83f05dc 78 error("Cannot initialize RTC with LSE\n");
bogdanm 0:9b334a45a8ff 79 }
mbed_official 71:a5b1c83f05dc 80 #else
mbed_official 71:a5b1c83f05dc 81 // Enable LSI clock
mbed_official 71:a5b1c83f05dc 82 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
mbed_official 71:a5b1c83f05dc 83 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured!
mbed_official 71:a5b1c83f05dc 84 RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
mbed_official 71:a5b1c83f05dc 85 RCC_OscInitStruct.LSIState = RCC_LSI_ON;
mbed_official 71:a5b1c83f05dc 86 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
mbed_official 71:a5b1c83f05dc 87 error("Cannot initialize RTC with LSI\n");
mbed_official 71:a5b1c83f05dc 88 }
mbed_official 71:a5b1c83f05dc 89 // Connect LSI to RTC
mbed_official 71:a5b1c83f05dc 90 PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC;
mbed_official 71:a5b1c83f05dc 91 PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSI;
mbed_official 71:a5b1c83f05dc 92 if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK) {
mbed_official 71:a5b1c83f05dc 93 error("Cannot initialize RTC with LSI\n");
mbed_official 71:a5b1c83f05dc 94 }
mbed_official 71:a5b1c83f05dc 95 // This value is LSI typical value. To be measured precisely using a timer input capture for example.
mbed_official 71:a5b1c83f05dc 96 rtc_freq = 40000;
mbed_official 71:a5b1c83f05dc 97 #endif
bogdanm 0:9b334a45a8ff 98
mbed_official 48:b854a29e778d 99 // Check if RTC is already initialized
mbed_official 48:b854a29e778d 100 if ((RTC->ISR & RTC_ISR_INITS) == RTC_ISR_INITS) return;
mbed_official 48:b854a29e778d 101
bogdanm 0:9b334a45a8ff 102 // Enable RTC
bogdanm 0:9b334a45a8ff 103 __HAL_RCC_RTC_ENABLE();
bogdanm 0:9b334a45a8ff 104
bogdanm 0:9b334a45a8ff 105 RtcHandle.Init.HourFormat = RTC_HOURFORMAT_24;
bogdanm 0:9b334a45a8ff 106 RtcHandle.Init.AsynchPrediv = 127;
bogdanm 0:9b334a45a8ff 107 RtcHandle.Init.SynchPrediv = (rtc_freq / 128) - 1;
bogdanm 0:9b334a45a8ff 108 RtcHandle.Init.OutPut = RTC_OUTPUT_DISABLE;
bogdanm 0:9b334a45a8ff 109 RtcHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
bogdanm 0:9b334a45a8ff 110 RtcHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
bogdanm 0:9b334a45a8ff 111
bogdanm 0:9b334a45a8ff 112 if (HAL_RTC_Init(&RtcHandle) != HAL_OK) {
bogdanm 0:9b334a45a8ff 113 error("Cannot initialize RTC\n");
bogdanm 0:9b334a45a8ff 114 }
bogdanm 0:9b334a45a8ff 115 }
bogdanm 0:9b334a45a8ff 116
bogdanm 0:9b334a45a8ff 117 void rtc_free(void)
bogdanm 0:9b334a45a8ff 118 {
bogdanm 0:9b334a45a8ff 119 // Enable Power clock
bogdanm 0:9b334a45a8ff 120 __HAL_RCC_PWR_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 121
bogdanm 0:9b334a45a8ff 122 // Enable access to Backup domain
bogdanm 0:9b334a45a8ff 123 HAL_PWR_EnableBkUpAccess();
bogdanm 0:9b334a45a8ff 124
bogdanm 0:9b334a45a8ff 125 // Reset Backup domain
bogdanm 0:9b334a45a8ff 126 __HAL_RCC_BACKUPRESET_FORCE();
bogdanm 0:9b334a45a8ff 127 __HAL_RCC_BACKUPRESET_RELEASE();
bogdanm 0:9b334a45a8ff 128
bogdanm 0:9b334a45a8ff 129 // Disable access to Backup domain
bogdanm 0:9b334a45a8ff 130 HAL_PWR_DisableBkUpAccess();
bogdanm 0:9b334a45a8ff 131
bogdanm 0:9b334a45a8ff 132 // Disable LSI and LSE clocks
bogdanm 0:9b334a45a8ff 133 RCC_OscInitTypeDef RCC_OscInitStruct;
bogdanm 0:9b334a45a8ff 134 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
bogdanm 0:9b334a45a8ff 135 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
bogdanm 0:9b334a45a8ff 136 RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
bogdanm 0:9b334a45a8ff 137 RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
bogdanm 0:9b334a45a8ff 138 HAL_RCC_OscConfig(&RCC_OscInitStruct);
bogdanm 0:9b334a45a8ff 139
mbed_official 71:a5b1c83f05dc 140 #if DEVICE_RTC_LSI
bogdanm 0:9b334a45a8ff 141 rtc_inited = 0;
mbed_official 71:a5b1c83f05dc 142 #endif
bogdanm 0:9b334a45a8ff 143 }
bogdanm 0:9b334a45a8ff 144
bogdanm 0:9b334a45a8ff 145 int rtc_isenabled(void)
bogdanm 0:9b334a45a8ff 146 {
mbed_official 71:a5b1c83f05dc 147 #if DEVICE_RTC_LSI
mbed_official 71:a5b1c83f05dc 148 return rtc_inited;
mbed_official 71:a5b1c83f05dc 149 #else
mbed_official 71:a5b1c83f05dc 150 if ((RTC->ISR & RTC_ISR_INITS) == RTC_ISR_INITS) {
mbed_official 71:a5b1c83f05dc 151 return 1;
mbed_official 71:a5b1c83f05dc 152 } else {
mbed_official 71:a5b1c83f05dc 153 return 0;
mbed_official 71:a5b1c83f05dc 154 }
mbed_official 71:a5b1c83f05dc 155 #endif
bogdanm 0:9b334a45a8ff 156 }
bogdanm 0:9b334a45a8ff 157
bogdanm 0:9b334a45a8ff 158 /*
bogdanm 0:9b334a45a8ff 159 RTC Registers
bogdanm 0:9b334a45a8ff 160 RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday
bogdanm 0:9b334a45a8ff 161 RTC_Month 1=january, 2=february, ..., 12=december
bogdanm 0:9b334a45a8ff 162 RTC_Date day of the month 1-31
bogdanm 0:9b334a45a8ff 163 RTC_Year year 0-99
bogdanm 0:9b334a45a8ff 164 struct tm
bogdanm 0:9b334a45a8ff 165 tm_sec seconds after the minute 0-61
bogdanm 0:9b334a45a8ff 166 tm_min minutes after the hour 0-59
bogdanm 0:9b334a45a8ff 167 tm_hour hours since midnight 0-23
bogdanm 0:9b334a45a8ff 168 tm_mday day of the month 1-31
bogdanm 0:9b334a45a8ff 169 tm_mon months since January 0-11
bogdanm 0:9b334a45a8ff 170 tm_year years since 1900
bogdanm 0:9b334a45a8ff 171 tm_wday days since Sunday 0-6
bogdanm 0:9b334a45a8ff 172 tm_yday days since January 1 0-365
bogdanm 0:9b334a45a8ff 173 tm_isdst Daylight Saving Time flag
bogdanm 0:9b334a45a8ff 174 */
bogdanm 0:9b334a45a8ff 175 time_t rtc_read(void)
bogdanm 0:9b334a45a8ff 176 {
bogdanm 0:9b334a45a8ff 177 RTC_DateTypeDef dateStruct;
bogdanm 0:9b334a45a8ff 178 RTC_TimeTypeDef timeStruct;
bogdanm 0:9b334a45a8ff 179 struct tm timeinfo;
bogdanm 0:9b334a45a8ff 180
bogdanm 0:9b334a45a8ff 181 RtcHandle.Instance = RTC;
bogdanm 0:9b334a45a8ff 182
bogdanm 0:9b334a45a8ff 183 // Read actual date and time
bogdanm 0:9b334a45a8ff 184 // Warning: the time must be read first!
bogdanm 0:9b334a45a8ff 185 HAL_RTC_GetTime(&RtcHandle, &timeStruct, RTC_FORMAT_BIN);
bogdanm 0:9b334a45a8ff 186 HAL_RTC_GetDate(&RtcHandle, &dateStruct, RTC_FORMAT_BIN);
bogdanm 0:9b334a45a8ff 187
bogdanm 0:9b334a45a8ff 188 // Setup a tm structure based on the RTC
bogdanm 0:9b334a45a8ff 189 timeinfo.tm_wday = dateStruct.WeekDay;
bogdanm 0:9b334a45a8ff 190 timeinfo.tm_mon = dateStruct.Month - 1;
bogdanm 0:9b334a45a8ff 191 timeinfo.tm_mday = dateStruct.Date;
bogdanm 0:9b334a45a8ff 192 timeinfo.tm_year = dateStruct.Year + 100;
bogdanm 0:9b334a45a8ff 193 timeinfo.tm_hour = timeStruct.Hours;
bogdanm 0:9b334a45a8ff 194 timeinfo.tm_min = timeStruct.Minutes;
bogdanm 0:9b334a45a8ff 195 timeinfo.tm_sec = timeStruct.Seconds;
bogdanm 0:9b334a45a8ff 196
bogdanm 0:9b334a45a8ff 197 // Convert to timestamp
bogdanm 0:9b334a45a8ff 198 time_t t = mktime(&timeinfo);
bogdanm 0:9b334a45a8ff 199
bogdanm 0:9b334a45a8ff 200 return t;
bogdanm 0:9b334a45a8ff 201 }
bogdanm 0:9b334a45a8ff 202
bogdanm 0:9b334a45a8ff 203 void rtc_write(time_t t)
bogdanm 0:9b334a45a8ff 204 {
bogdanm 0:9b334a45a8ff 205 RTC_DateTypeDef dateStruct;
bogdanm 0:9b334a45a8ff 206 RTC_TimeTypeDef timeStruct;
bogdanm 0:9b334a45a8ff 207
bogdanm 0:9b334a45a8ff 208 RtcHandle.Instance = RTC;
bogdanm 0:9b334a45a8ff 209
bogdanm 0:9b334a45a8ff 210 // Convert the time into a tm
bogdanm 0:9b334a45a8ff 211 struct tm *timeinfo = localtime(&t);
bogdanm 0:9b334a45a8ff 212
bogdanm 0:9b334a45a8ff 213 // Fill RTC structures
bogdanm 0:9b334a45a8ff 214 dateStruct.WeekDay = timeinfo->tm_wday;
bogdanm 0:9b334a45a8ff 215 dateStruct.Month = timeinfo->tm_mon + 1;
bogdanm 0:9b334a45a8ff 216 dateStruct.Date = timeinfo->tm_mday;
bogdanm 0:9b334a45a8ff 217 dateStruct.Year = timeinfo->tm_year - 100;
bogdanm 0:9b334a45a8ff 218 timeStruct.Hours = timeinfo->tm_hour;
bogdanm 0:9b334a45a8ff 219 timeStruct.Minutes = timeinfo->tm_min;
bogdanm 0:9b334a45a8ff 220 timeStruct.Seconds = timeinfo->tm_sec;
bogdanm 0:9b334a45a8ff 221 timeStruct.TimeFormat = RTC_HOURFORMAT12_PM;
bogdanm 0:9b334a45a8ff 222 timeStruct.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
bogdanm 0:9b334a45a8ff 223 timeStruct.StoreOperation = RTC_STOREOPERATION_RESET;
bogdanm 0:9b334a45a8ff 224
bogdanm 0:9b334a45a8ff 225 // Change the RTC current date/time
bogdanm 0:9b334a45a8ff 226 HAL_RTC_SetDate(&RtcHandle, &dateStruct, RTC_FORMAT_BIN);
bogdanm 0:9b334a45a8ff 227 HAL_RTC_SetTime(&RtcHandle, &timeStruct, RTC_FORMAT_BIN);
bogdanm 0:9b334a45a8ff 228 }
bogdanm 0:9b334a45a8ff 229
bogdanm 0:9b334a45a8ff 230 #endif